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While cleaning my storage closet, I found after many years my old S2 Gold CD
I decided to see if it was still working and long story short.
It was.
I also made a discovery, the GOG version of S2 Gold is MISSING 130 bonus maps that were included with the S2 CD.

I have rectified this.

download here, this leads to my Google Drive.

Just extract to your "worlds" directory in your S2 install dir.